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(NoMod'eL) 4 H. J. JOHN$ON.

BOLT HEADING MACHINE. No. 254,484. Patented Mar. 7,1882.

mu m IIII I UNITED STATES PATENT OFFICE.

HENRY J. JOHNSON, OF PROVIDENCE, R. 1., AssIeNoE, BY MEsNE ASSIGN- MENTs, TO PLUMB, BURDIOT & BAENAED, OF BUFFALO, Y.

BOLT-HEADING MACHINE.

SPECIFICATION formingpart of Letters Patent No. 254,484, dated March 7, 1882.

Application filed November 29, 1881. (No model.)

To all whom "it may concern:

Be it known that I, HENRY J. J oHNsoN, of Providence, in the county of Providence and Sta'te of Rhode Island, have invented certain new and useful Improvements in Bolt-Heading Machines, of which the following is a specification.

My invention relates'to those parts of a boltheading or similar machine which operate to forge the blank to the required form. This work is usually performed by dies carried by slides which are constructed to slide in guides or grooves. The blanks are highly heated before being subjected to the machine; and in order that the machine may not become unduly heated,it is customary to keep it cool by means of one or more jets of water. In the operation of forging, the scale or oxide of iron separatesfrom the blanks and is carried along with the water; and in machines made previously to my invention this scale and water penetrated the interstices between the dieslides and their guides or grooves, and being of a gritty nature caused the sliding-surfaces to wear away rapidly, thereby involving frequent repairs and renewals of the parts.

The object of this invention is to prevent such wear by the scale 5 and it consists of certain combinations of devices, which are set forth in the claims at the close of this specification.

In order that my said invention may be fully understood, I will proceed, with the aid of the accompanying drawings, to describe the best mode in which I have embodied the same in a.

bolt-heading machine for forging the heads of bolt-blanks.

Figure 1 of said drawings represents a front view of so much of the bolt-heading machine as is necessary to an understanding of my invention. Fig. 2 represents a vertical section of the same, taken at the line a: w of Fig. 1.

The forging in said machine is effected by means of an upset or heading die, E, operating in the direction of the length of the boltblank, and four forging-dies, B B B B, operating crosswise of said length. Each of the said side forging-dies B is secured to a slide, 0, which is fitted to slide in a guide-groove formed in the frame of the machine. When the machine is at work the dies are prevented from overheating by several small jets of water, which are allowed to spurt against them.

In order that the slides and their seats in their guiding-grooves may be protected from the action of the scale washed into them by the water, two kinds of shields are provided. One of these is the tubular shield D, which incloses the space between the ends of the dieslides 0, through which the upset or heading die E works, and this tubular shield is connected with the frame of the machine, so that it intercepts the passage of water and scale to the sliding-surfaces of the die-slides U and conducts such water and scale to a pocket or receiver, F, from which they escape by a passage, H.

The second shield is the shield plate A, which is interposed between the ends of the side dies, B, andthe guides of the die-slides C, and intercepts the passage of water and scale in a backward direction to the sliding surfaces of the slides and their guides. This shield-plate may be made in one piece with the tubular shield D, as represented in the drawings, or may be made separately therefrom.

In order that the shield-plate A may be of comparatively large size without affecting the length of the sliding-surfaces of the die-slides, the ends of the die-slides are recessed, as represented in the drawings, so that the shieldplate overlaps them.

The parts of the machine which are not above described may be constructed and operated in any approved manner, and the forms of the shields may be varied as found expedient for the particular form of the machine to which they are applied. The receiver F-also may be constructed separately from the frame of the machine and secured to it so as to catch the water and scale.

I claim as my invention- 1. The combination, substantially as before set forth, of the die-slides and the tubular shield.

2. The combination, substantially as before set forth, of the die-slides and the shield-plate. 3., The combination, substantially as before set forth, of the die-slides, the tubular shield, Witness my hand this 24th day of Novemand the frame of the machine, fitted with the her, A. D. 1881. receiver for the scale and water.

4. The combination, substantially as before set forth, of the die-slides, constructed with \Vitnesses: recessed ends, and the shield-plate, extended THEO. W. PHILLIPS, to overlap said recessed ends. ALFRED M. LAKE.

HENRY J. JOHNSON. 

